Vlll PKEFAOK. 



with a view of presenting thera in the best form for use in the scientific 

 world, and with no attempt to complete unfinished work. The Bibliography 

 has been carefully completed by Miss Julia E. Sanders, of Davenport, Iowa, 

 by laborious compilations from Mr. Putnam's voluminous notes and ex- 

 tracts. Mr. Osborn and Miss Sanders have also kindly attended to the proof- 

 reading in the publication of these papers. 



The paper of Mr. Putnam on Solpugidie is illustrated by four plates, pre- 

 pared from his own original drawings of the insect. The engravings were 

 made by Mr. A. Meisel, the eminent engraver of Boston. This work was 

 kindly superintended by Dr. H. A. Hagen, of Cambridge. 



The steel-plate engraving of Mr. Putnam was obtained and presented by 

 his parents. It is the work of Mr. G. R. Hall, of Brooklyn, N. Y., and is 

 considered an excellent likeness. 



The wood-cuts on pages 8G, 87, 106, and 128, illustrating papers of Pro- 

 fessor Berthoud and Professor Pratt, were executed by Mr. Putnam himself. 

 The four plates used in illustrating the paper of W. J. Hoffman on Mexican 

 antiquities, were kindlj' furnished by the Smithsonian Institution. 



The names of the subscribers to tliis publication will be found at the end 

 of the volume. 



Davenport, February 23, 1883. 



